SCH4U 3.3 Electron Configurations EXAM REVIEW

Which of the following statements about "the fourth quantum number" is INCORRECT?

• It describes a property of the electron that results from its particle-like nature.

• It specifies the direction in which the electron is spinning

• It has only two possible values: ½ or -½

• It tells one that the electron is spin on an axis clockwise or counter clockwise.

• None of the other 4 statements are INCORRECT.

The allowed values of 1st quantum number are

• 1, 2, 3, 4…

• 0, 1, 2 . . . (n - 1)

• -l, . . . -1, 0, 1, . . . +l

• ½ or -½

The allowed values of 2nd quantum number are

• 1, 2, 3, 4…

• 0, 1, 2 . . . (n - 1)

• -l, . . . -1, 0, 1, . . . +l

• ½ or -½

The allowed values of 3rd quantum number are

• 1, 2, 3, 4…

• 0, 1, 2 . . . (n - 1)

• -l, . . . -1, 0, 1, . . . +l

• ½ or -½

The allowed values of 4th quantum number are

• 1, 2, 3, 4…

• 0, 1, 2 . . . (n - 1)

• -l, . . . -1, 0, 1, . . . +l

• ½ or -½

This principle or law places a limit on the total number of electrons that may occupy any orbital.

• Pauli exclusion principle

• aufbau principle.

• Hund's principle

This imaginary process of building up the ground state electronic structure for each atom, in order of atomic

number, is called the __________________________

• Pauli exclusion principle

• aufbau principle

• Hund's rule

If you “obey” _______________________, no two electrons can have the same set of quantum numbers.

• Pauli exclusion principle

• aufbau principle

• Hund's rule

T/F - Another way of stating the exclusion principle is that no two electrons in an atom have the same four quantum numbers.

• True

• False

An atom’s __________________________is a shorthand notation that shows the number and arrangement of electrons in its orbitals.

• electron configuration

• quantum configuration

• electron numbers

• electron arrangement